Billie Jean King Cup
Emma Raducanu and Katie Boulter lead Great Britain to BJK Cup quarters
GB brushed aside Germany Friday to set up a last eight meeting with defending champions Canada.
This is Siegemund's second win over Wang, with the first being at Roland Garros Qualifying.
The duo defeated Desirae Krawczyk and Neal Skupski Thursday, 6-4, 7-5.
The eighth-seeded Spaniards dominated in a 6-0, 6-2 victory over No. 6 seeds Barbora Krejcikova and Laura Siegemund to win their home WTA 1000 title.